Wednesday, July 1, 2015

Circuit Schematic Automatic Speed Controller for Fans and Coolers

Eltronicschool. - Do you want to build your own automatic speed controller for fans and coolers now? Maybe you can use circuit schematic like the figure 1 below as your reference to build this job and work. This circuit schematic is Circuit Schematic Automatic Speed Controller for Fans and Coolers.

Circuit Schematic

Figure 1. Circuit Schematic Automatic Speed Controller for Fans and Coolers
(Source: ElectronicsZone)

Component Parts
  1. IC1 = NE555
  2. IC2 = CD4017B
  3. IC3 = CD4017B
  4. Relay
  5. Transistors
  6. Diodes

Description

Circuit schematic like in figure 1 above is Circuit Schematic Automatic Speed Controller for Fans and Coolers based on NE555 IC and CMOS CD4017 IC. According Electronic Zone site describe that During summer nights, the temperature is initially quite high. As time passes, the temperature starts dropping. Also, after a person falls asleep, the metabolic rate of one?s body decreases. Thus, initially the fan/cooler needs to be run at full speed. As time passes, one has to get up again and again to adjust the speed of the fan or the cooler.The device presented here makes the fan run at full speed for a predetermined time. 

The speed is decreased to medium after some time, and to slow later on. After a period of about eight hours, the fan/cooler is switched off.Fig. 1 shows the circuit diagram of the system. IC1 (555) is used as an astable multivibrator to generate clock pulses. The pulses are fed to decade dividers/counters formed by IC2 and IC3. These ICs act as divide-by-10 and divide-by-9 counters, respectively. The values of capacitor C1 and resistors R1 and R2 are so adjusted that the final output of IC3 goes high after about eight hours.The first two outputs of IC3 (Q0 and Q1) are connected (ORed) via diodes D1 and D2 to the base of transistor T1. Initially output Q0 is high and therefore relay RL1 is energised. It remains energised when Q1 becomes high. Please read more the description of Circuit Schematic Automatic Speed Controller for Fans and Coolers from the original source using link here.


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